I think in the 16th.chapter of garuDa purANa. There are verses which talk about Sri Shiva as supreme being.
Can.someone please give insight on this?
okay i found the verses you were searching:— CHAPTER XVI An Account of the Law for Liberation.
1-4. Garuḍa said: I have heard fromyou, O Ocean of compassion, about the transmigrating of the individual, through ignorance, in the worlds of change. I now wish to hear about the means for eternal liberation.O Lord, O Ruler of the Shining Ones, compassionate to those who seek refuge,--in this terrible world of change, in the unsubstantial, in all deep miseries,The endless multitudes of individuals, placed in various kinds of bodies, are born and die--of them no end is known.Always miserable in this world, no one is ever known to be happy. O Lord of Liberation, tell me by what means they may obtain release, O Lord.
5-7. The Blessed Lord said: Listen, O Tārkṣya, and I will explain to you what you have asked, even by the hearing of which a man is released from the world of change.There is a Shining One, Śiva, who has the nature of Supreme Brāhmaṇ, who is partless, all-knowing, all-doing, Lord of all, stainless and secondless,Self-illumined, beginningless and endless, beyond the Beyond, without attributes, Being and Knowing and Bliss. That which is considered the individual is from a part of Him.
8-10 These, like sparks of a fire, with beginningless ignorance, separated and encased in bodies bybeginningless karma,Are fettered by forms of good and evil, giving happiness and misery,--with nationality of body, length of life, and fortune born of karma.In every life obtained. They have also, O Bird, a higher and more subtle body, theliṅga, lasting until liberation.
I think this is what you were searching for :)